Nylon gets stuck at end of print

[SchraubenPhil 1]

Hello,

 

I have a weird bug occurring when printing with dual extrusion.

 

I will describe the circumstances:

I'm printing parts combined out of Ultimaker Nylon (Print Core 1) and Ultimaker TPU 95A (Print Core 2).

The parts come out nicely, but when the print is finished, the Nylon always gets stuck in the print core. The core even gets pulled back into the print head. Then the wizard for stuck material appears.

When i follow the instructions, print core 1 gets heated up again and clicks back down hard when the Nylon is hot enough. (It seems to be free at this point)

I still have to remove the bowden tube and cut the material to finish the wizard. Then it gets unloaded.

As if that wasn't enough, after finishing the process, the print bed violently falls down without much resistance from the Z-steppers.

 

Long story short: I think the printers workflow when unloading the material has a bug. After printing the last layer with TPU, print core 1 doesn't heat up again and therefore fails to unload the Nylon properly.

 

I would appreciate some help - maybe i'm doing something wrong. If not, maybe this could be looked over for future bug fixes.

 

Thanks in advance. 

[dcschooley 9]

I'm having the exact same problem. Have you found a solution? I've found that you don't need to remove the Bowden tube or cut anything. Just let the core heat back up. 

[SchraubenPhil 1]

Sadly i didn't find a solution - now I even have the problem occurring with another Filament - Polymaker PA6-CF.

On 2/8/2022 at 5:04 PM, dcschooley said:

I'm having the exact same problem. Have you found a solution? I've found that you don't need to remove the Bowden tube or cut anything. Just let the core heat back up. 

I remove the tube so the Feeder doesn't Push the Filament through the nozzle with the wizard. Then it can be unloaded.

The print bed also falls down after the wizard finished.

 

What i did is replace the front fan because i thought the filament gets stuck in the tube of the core.

Nothing changed - the printer seems to make a cold-pull but can't do it because the PA is too sticky.

 

Is there a way to override this cold pull?

It's not very efficient when i have to remove the filament manually after every print - if i wanted to do that i could have bought a much cheaper printer.

[Advocult 1]

I am also having this issue on a brand new S5 pro bundle using CF material.

[dcschooley 9]

I've eliminated the problem by setting the standby temperature to 175C in Cura for the nylon.